Diseases and Conditions

Find doctor-approved information about symptoms, causes, diagnosis, treatment and prevention of common diseases and conditions.

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All conditions that start with the letter M
  • Mad Cow Disease

    Mad cow disease is an extremely rare disease spread by eating beef from a diseased cow. It progresses quickly and…

  • Malaria

    Malaria is a serious disease caused by parasites that are carried by mosquitos. It is most common in countries with…

  • Male Breast Cancer

    Breast cancer is a type of cancer that begins in the breast. Men can get breast cancer even though it…

  • Male Infertility

    About one-third of cases of infertility are caused by issues that affect men. Learn what this means and what your…

  • Mallet Finger

    Mallet finger is an injury to your fingertip that makes it hard to straighten the finger. It is common in…

  • Mass Psychogenic Illness

    Mass psychogenic illness is when people in a group start feeling sick at the same time, but there is no…

  • Mastitis

    Mastitis is an inflammation of the breast. It is usually caused by an infection and often happens while a woman…

  • Mastocytosis

    Mastocytosis is the abnormal growth of mast cells in the body. Mast cells are part of the immune system, which…

  • Measles

    What is measles? Measles (also called rubeola) is a serious respiratory illness. This means it affects the lungs and breathing tubes. It also causes a rash and a fever. It is a very contagious disease. It can be spread to others very easily. In

  • Meckel's Diverticulum

    A Meckel’s diverticulum is a pouch on the small intestine. Learn about the possible symptoms and treatments.

  • Meconium Aspiration Syndrome (MAS)

    Meconium aspiration syndrome happens when a newborn inhales meconium and amniotic fluid before, during, or after labor and delivery.

  • Melasma

    Melasma is a common skin condition that causes brown patches to appear on the skin, usually on the face.

  • Meniere’s Disease

    Meniere’s disease is a problem with your inner ear. It can be troublesome but is not contagious, and it isn’t…

  • Meningitis

    Bacterial and viral meningitis cause the tissue around your brain and spinal cord to swell. Bacterial meningitis can cause brain…

  • Menopause

    Menopause is when a woman’s menstrual periods permanently end. It happens because, as a woman ages, her ovaries make fewer…

  • Metabolic Syndrome

    Metabolic syndrome is the term used to describe a set of risk factors for heart disease. These include high blood…

  • Methicillin-resistant Staphylococcus aureus (MRSA)

    MRSA is a bacterial infection that is resistant to methicillin and many other antibiotics. It spreads easily through .

  • Microscopic Hematuria

    If you have microscopic hematuria, you have red blood cells in your urine. These blood cells are so small that…

  • Migraines

    Learn about the different kinds of migraine headaches and their symptoms and treatments.

  • Mitral Valve Prolapse

    Mitral valve prolapse is when the flaps of your heart’s mitral valve are “floppy” and don’t close properly.

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